// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CC_OUTPUT_OVERLAY_STRATEGY_UNDERLAY_H_
#define CC_OUTPUT_OVERLAY_STRATEGY_UNDERLAY_H_

#include "base/macros.h"
#include "cc/output/overlay_processor.h"

namespace cc {

class OverlayCandidateValidator;

// The underlay strategy looks for a video quad without regard to quads above
// it. The video is "underlaid" through a black transparent quad substituted
// for the video quad. The overlay content can then be blended in by the
// hardware under the the scene. This is only valid for overlay contents that
// are fully opaque.
class CC_EXPORT OverlayStrategyUnderlay : public OverlayProcessor::Strategy {
public:
    explicit OverlayStrategyUnderlay(
        OverlayCandidateValidator* capability_checker);
    ~OverlayStrategyUnderlay() override;

    bool Attempt(ResourceProvider* resource_provider,
        RenderPass* render_pass,
        OverlayCandidateList* candidate_list) override;

private:
    OverlayCandidateValidator* capability_checker_; // Weak.

    DISALLOW_COPY_AND_ASSIGN(OverlayStrategyUnderlay);
};

} // namespace cc

#endif // CC_OUTPUT_OVERLAY_STRATEGY_UNDERLAY_H_
